In all of the TTASxxx objects that allow the user to enter a value (including TTASRadioButton and TTASCheckBox) you can set this property to allow the user to use the ENTER key as though it were a TAB. This means that users used to using the ENTER key to move from field to field will be able to continue to do so.
The property can be changed at runtime. The possible values are True (checked) (treat the ENTER key as a TAB) or False.
Page url: http://www.cassoftware.com/tas/manual/returnistab.htm